How do you make a variable that says hi if hit once and you already clicked me if hit again?

Question

I tried

function myFunction() {
  alert("hi")
  myvar == 1
}
var myvar = 0;
if (myvar == 1) {
  alert("you already clicked me!")
 }

<button onclick="myFunction()">hi</button>

but that did not work.

I want one to work for a game I am making in pure code. If you place a wall (hit the button) it will say wall placed. If you try to hit the button again, it will say wall already placed, because you can not place a wall inside of a wall.

First, the `if (myvar == 1) { alert("you already clicked me!") }` needs to be within the function, or else it will be evaluated at load. Second, reread on how [operators work, especially `==`](https://stackoverflow.com/questions/11871616/in-javascript-vs) — Asons, May 05 '19 at 19:00

score 0 · Answer 1 · answered May 05 '19 at 19:01

try this -

var myvar = 0;
function myFunction() {
  alert(myvar === 0 ? "hi" : "you already clicked me!")
  myvar = 1;
}

there was few errors in you code -

assignment was wrong (this was equality) -

myvar == 1

the second rule should be inside the function

if (myvar == 1) {
  alert("you already clicked me!")
 }

score 0 · Answer 2 · answered May 05 '19 at 19:01

You have to put the check for the variable value and the increasing of the variable inside of the function of course.

The line myvar == 1 itself will actually result in the boolean false and is not assigned to a variable, so it won't do anything.

var myvar = 0;

function myFunction() {
  if (myvar > 0) {
    alert("you already clicked me " + myvar + "x!")
  } else {
    alert("hi")
  }
  myvar = myvar + 1; // or myvar++;
}

<button onclick="myFunction()">hi</button>

Thanks! Now time to make that game! – c-- May 07 '19 at 20:56 — c--, May 07 '19 at 20:56

How do you make a variable that says hi if hit once and you already clicked me if hit again?

2 Answers2